Laser ,Types and Use

-
Image
  LASER :-                    LASER is an acronym of  Light Amplification by stimulated emission of Radiation. It is an optical device which produces an intensive beam of highly coherent, Monochromatic light[ Electromagnetic radiation, especially visible radiation, of only one frequency or wavelength]. It can travel over great distance without spread.   LASER LIGHT :-                                   1. It is very different than normal light and contains only one specific wavelength of light.                                 2. A laser light has very tight beam and is very strong and concentrated.                                 3. A laser light can go to the moon and then come back to the earth without any appreciable change in intensity.                                  4. The light released is monochromatic (consists of only one wavelength) and coherent.  LIPS ( LASER Induced Plasma Spectroscopy) :- It is based on plasma formation on temperature basis, the material absorbs all th
Post a Comment

SONAR and communication of Bats

-
What is SONAR?
                    - The Word SONAR stands for Sound Navigation And Ranging. Sonar is an apparatus used to find the depth of the sea or to locate underwater things like shoals of fish, shipwrecks, and enemy submarines. It is used ultrasonic waves to measure the distance, direction and speed of underwater objects. 
Ultrasonic sound waves use because
- These waves have high penetrating power, they can penetrate into sea-water to a large extent to locate the underwater objects or to determine the depth of the sea.
- These waves cannot be confused with engine noises or other sound made by the ship as they can not be heard by human beings. 

 -Use of Ultrasonic waves by the Bats

                                          - Bats search out prey and fly in dark by emitting and detecting the reflection of ultrasonic waves. the method used by some animals like bats, portoises and dolphins to locate the object by hearing the echoes of their ultrasonic squeaks is known as Echolocation.
  - Bats emit high-frequency or high pitched ultrasonic squeaks while flying and listen to the echoes of produced by the reflection of there squeaks from obstacles in their path. From the time taken by the echoes to be heard, bats can determine the distance of the obstacles or prey and can avoid the obstacles by changing their path or catch the prey.

Comments

Post a Comment

Popular posts from this blog

***Rainfall and Artificial Raifall***

-
Image
****Mawsynram[INDIA]**** (A village in the state of Meghalaya(one of the seven sisters in north-eastern India) [Based on the data of a recent few decades, it appears to be the wettest place in the world or the place with the highest average annual rainfall.  Mawsynram  receives over 10,000 millimetres of rain in an average year, and the vast majority of the rain it gets falls during the monsoon months.] Reason of Rainfall-                              The major cause of rain production is moisture moving along three-dimensional zones of temperature and moisture contrasts known as  weather fronts . If enough moisture and upward motion are present, precipitation falls from   clouds (those with strong upward vertical motion) such  cumulonimbus   (thunder clouds) which can organize into narrow rainbands . In mountainous areas, heavy precipitation is possible where upslope flow   is maximized within windward  sides of the terrain  at  elevation which forces moist air to co
Read more

Nuclear Fission and Nuclear Power Plant

-
Image
What is Nuclear Fission? - The reaction in which a heavy nucleus splits into two or more smaller nuclei with the evolution of a large amount of energy is called nuclear fission reaction. - The fission process often produces gamma photons , and release a very large amount of energy. - Nuclear   fission of heavy elements was discovered on December 17, 1938, by German Otto Hahn. - Fission  is a form of nuclear transmutation because the resulting fragments are not the same element as the original atom. - Many types of nuclear reactions  are currently known but Nuclear fission differs importantly from other types of nuclear reactions, in that it can be amplified and sometimes controlled via a nuclear chain reaction  (one type of general chain reaction ). In such a reaction, free neutrons  released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission. Nuclear Power Plant-   The most important use of nuclear energy is the ge
Read more

Iron seems colder in winter and Heat

-
Image
Transmission of heat- Heat flows from hot body to a colder body, this flow of heat is called transmission of heat. - Iron seems colder in winter-                                              During winter, the temperature of our body is higher than the room temperature. When we touch iron, the iron rapidly conducts heat from our hand and gives a cold feeling. Wood, on the other hand, is a bad conductor of heat, it conducts heat slowly from our hand and appears cold. - The water from a hand pump is warm in winter and cold in summer- This is because in winter the outside temperature is low and in summer outside temperature is higher as compared to the temperature of water obtained from underground water, which remains practically unchanged due to earth being bad conduct of heat. - Why we use blankets and quilts filled with cotton good in winter- Because the fibres of woollen clothes have larger interspaces than cotton clothes and the air is filled in these spaces. Since air is b
Read more